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The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls. This jar contains APIs for Java 8 and later.
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package org.bouncycastle.asn1.cmp;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;

/**
 *  *      ErrorMsgContent ::= SEQUENCE {
 *          pKIStatusInfo          PKIStatusInfo,
 *          errorCode              INTEGER           OPTIONAL,
 *          -- implementation-specific error codes
 *          errorDetails           PKIFreeText       OPTIONAL
 *          -- implementation-specific error details
 *      }
 * 
 */
public class ErrorMsgContent
    extends ASN1Object
{
    private final PKIStatusInfo pkiStatusInfo;
    private ASN1Integer errorCode;
    private PKIFreeText errorDetails;

    private ErrorMsgContent(ASN1Sequence seq)
    {
        Enumeration en = seq.getObjects();

        pkiStatusInfo = PKIStatusInfo.getInstance(en.nextElement());

        while (en.hasMoreElements())
        {
            Object o = en.nextElement();

            if (o instanceof ASN1Integer)
            {
                errorCode = ASN1Integer.getInstance(o);
            }
            else
            {
                errorDetails = PKIFreeText.getInstance(o);
            }
        }
    }

    public ErrorMsgContent(PKIStatusInfo pkiStatusInfo)
    {
        this(pkiStatusInfo, null, null);
    }

    public ErrorMsgContent(
        PKIStatusInfo pkiStatusInfo,
        ASN1Integer errorCode,
        PKIFreeText errorDetails)
    {
        if (pkiStatusInfo == null)
        {
            throw new IllegalArgumentException("'pkiStatusInfo' cannot be null");
        }

        this.pkiStatusInfo = pkiStatusInfo;
        this.errorCode = errorCode;
        this.errorDetails = errorDetails;
    }

    public static ErrorMsgContent getInstance(Object o)
    {
        if (o instanceof ErrorMsgContent)
        {
            return (ErrorMsgContent)o;
        }

        if (o != null)
        {
            return new ErrorMsgContent(ASN1Sequence.getInstance(o));
        }

        return null;
    }

    public PKIStatusInfo getPKIStatusInfo()
    {
        return pkiStatusInfo;
    }

    public ASN1Integer getErrorCode()
    {
        return errorCode;
    }

    public PKIFreeText getErrorDetails()
    {
        return errorDetails;
    }

    /**
     *      * ErrorMsgContent ::= SEQUENCE {
     *                        pKIStatusInfo          PKIStatusInfo,
     *                        errorCode              INTEGER           OPTIONAL,
     *                        -- implementation-specific error codes
     *                        errorDetails           PKIFreeText       OPTIONAL
     *                        -- implementation-specific error details
     * }
     * 
     *
     * @return a basic ASN.1 object representation.
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector(3);

        v.add(pkiStatusInfo);
        addOptional(v, errorCode);
        addOptional(v, errorDetails);

        return new DERSequence(v);
    }

    private void addOptional(ASN1EncodableVector v, ASN1Encodable obj)
    {
        if (obj != null)
        {
            v.add(obj);
        }
    }
}